DocumentDB, How to work with continuationToken in a SP - azure

Question

The next SP suppose to run over the collection and keep query for the next batch of documents (10 docs every batch). but instead return the same 10 documents every time.
function sample(prefix) {
var continuations = [],
ids = [],
context = getContext(),
collection = context.getCollection(),
response = context.getResponse();
var queryOptions = { pageSize: 10, continuation: null };
for (i = 0; i < 10; i++) {
// get all user wish list actions
var query = "select * from w",
accept = collection.queryDocuments(collection.getSelfLink(), query, queryOptions, processMultiUsers);
if (!accept) throw "Unable to read user's sessions";
}
getContext().getResponse().setBody(ids);
function processMultiUsers(err, docs, options) {
if (err) throw new Error("Error: " + err.message);
if (docs == undefined || docs.length == 0) throw new Error("Warning: Users not exists");
for (j = 0; j < docs.length; j++) {
ids.push(docs[j].UserId);
}
queryOptions.continuation = options.continuation;
continuations.push(options.continuation);
}}

Answer 1

In the script that you wrote, the execution of the queries are done synchronously and they are queued up with the same initial continuation token, which is null. Instead, we need to take the token from the first query and then queue the next and continue.
The below sample should help achieve what you are looking for
function sample(continuationToken) {
var collection = getContext().getCollection();
var maxResult = 10;
var documentsProcessed = 0;
var ids = [];
var filterQuery = "select * from w";
tryQuery(continuationToken);
function tryQuery(nextContinuationToken) {
var responseOptions = { continuation: nextContinuationToken, pageSize: maxResult };
if (documentsProcessed >= maxResult || !query(responseOptions)) {
setBody(nextContinuationToken);
}
}
function query(responseOptions) {
return (filterQuery && filterQuery.length) ?
collection.queryDocuments(collection.getSelfLink(), filterQuery, responseOptions, onReadDocuments) :
collection.readDocuments(collection.getSelfLink(), responseOptions, onReadDocuments);
}
function onReadDocuments(err, docFeed, responseOptions) {
if (err) {
throw 'Error while reading document: ' + err;
}
documentsProcessed += docFeed.length;
for (var i = 0; i < documentsProcessed; i++) {
ids.push(docFeed[i].UserId);
}
if (responseOptions.continuation) {
tryQuery(responseOptions.continuation);
} else {
setBody(null);
}
}
function setBody(continuationToken) {
var body = { continuationToken: continuationToken, documentsProcessed: documentsProcessed, ids: ids };
getContext().getResponse().setBody(body);
}
}